Yes; if you use a multimeter and measure the resistance between A4 and SDA or between SCL and A5 you will get zero ohm. Do the test on the Uno without the shield connected (and to make sure that you don't blow up the meter, no power to the Uno).
Yes; if you use a multimeter and measure the resistance between A4 and SDA or between SCL and A5 you will get zero ohm. Do the test on the Uno without the shield connected (and to make sure that you don't blow up the meter, no power to the Uno).